Plate XXIX 



A. — FIRST RIB OF LEFT SIDE — OUTER ASPECT 



I. Tubercle. 2. Neck. 3. Head. 4. Anterior border. 5. Groove for accommodation of 

 dorsal roots of brachial plexus. 6, Posterior border. 7. Angle. 8. Facet for articulation with 

 costal cartilage. 



B. FIRST RIB OF LEFT SIDE — INNER ASPECT 



I. Head. 2. Tubercle. 



C. FIRST RIB OF LEFT SIDE SHOWING SEAT OF FRACTURE "a" 



